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Abstract

All-optical quasi logic gates are demonstrated by means of polarization-dependent four-wave mixing (FWM) in metal-insulator-metal (MIM) waveguides filled with a Kerr nonlinear medium. By using finite-difference-time-domain (FDTD) methods, we perform a quantitative comparison of the FWM efficiency associated with different pump polarization states. By manipulating the core thickness and the polarization properties of the pump and signals, all-optical NOT, NAND, NOR, and NXOR logical functions are obtained.

Figures (7)

(a) Cutoff wavelength of the TE dispersion relations with core thickness (W) ranging from 40 to 400 nm. Region I is the section where TE mode is cutoff, and region II is the section where TE mode can be excited. (b) ERI of TM (solid) and TE (dashed) dispersion relations with wavelength ranging from 630 to 770 nm with a core thickness of 300nm. (c) Transmission spectrum with a core thickness of 50 nm. (d) Transmission spectrum with a core thickness of 300 nm.